names=['a','b','c']
if names:
    for name in names:
        if name == "admin":
            print("Hello admin,would you like to see a status report?")
        else:
            print(f"Hello {name},thank you for logging in again.")
else:
        print("Are you sure you eant a plain pizza?")


current_users=["tom","army","admin","lias","jaine"]
new_users=["tom","army","P","n","M"]
new_users2=["m"]
for user in new_users:
    if user in current_users:
        print(f"{user}需要输入别的用户名")
    else:
        print(f'{user}这个用户名未使用')


numbers=list(range(1,10))
for number in numbers:
    if number == 1:
        print("1st")
    elif number == 2:
        print("2nd")
    elif number == 3:
        print("3rd")
    else:
        print(f"{number}th")